class_docstr: Tests the QubitCarry operator.
docstr: Test if ``QubitCarry`` works for superposition input states.
docstr_tok: ["Test","if","``","QubitCarry","``","works","for","superposition","input","states","."]
code: def test_superposition(self):
      """Test if ``QubitCarry`` works for superposition input states."""
      dev = qml.device("default.qubit", wires=4)
  
      @qml.qnode(dev)
      def circuit():
          qml.PauliX(wires=1)
          qml.Hadamard(wires=2)
          qml.QubitCarry(wires=[0, 1, 2, 3])
          return qml.probs(wires=3)
  
      result = circuit()
      assert np.allclose(result, 0.5)
  
imports: import copy
  import itertools
  import pytest
  import numpy
  import pennylane
  from pennylane.wires import Wires
label_desc: Use image node_id 2 for calling the TestQubitCarry obj's underlying member method code with example usage: obj.test_superposition() and returns: qml